Steel.



which I have NiTE STATES PATENT BEIGE.

HENRY D. BOOTH, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE MIDVALESTEEL COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

STEEL.

110,914,633. Specification of Letters Patent. Patented March 9, 1909.Application flled June 20, 1908. Serial No. 489,477. To all whom it mayconcern." a Carbon 1433 per centum Be it known that I, HENRY D. BOOTH, aPhosphorus .057 citizen of the United States, residing at PhilaManganese 1.22 delphia, county of Philadelphia, and State of ilicon .259Pennsylvania, have'invented a new and use- Sulfur .038 ful mprovement inSteel, of which the fol- Copper .72 lowing is a full, clear, and exactdescription. Vanadium .30

Heretofore it has been attempted to use copper in a steel mixture, forthe purpose of Having now fully described my invention, increasing thephysical properties of the steel. what I claim and desire to protect byLetters 40 However, the use of co er has been accom- :Patent is aniedwith considerab e troubles and de- 1. The method-of improving steel,which ects, such, for instance, as the tendency, if consists in addinthereto a small amount of sufficient copper be added to produce anotcopper and vana ium. able result, to have so large an amount of cop-2. A steel containing a small amount of 1per as to produce red-shortnessand also to copper and vanadium. ave some of the 00 per not properlyalloyed 3. The method of improving steel, which and remainin in t emixture in its origlnal consists in adding thereto from 1/2 to '1 1/2condition. I ave discovered that iftoasteel I per cent. of 00 per andfrom 1/10 to 6/10 per rnlxture containing copper in quantity safelycent. of vanadium.

insufficient to produce red-shortness and to d its appreciableseparation in the ultimatesteel,say from 1/2to1 1/2 ercent.,Iadda verysmall quantity of vana ium,-say from 0 per cent. I can produce anefiicient result without any of the deleterious efl'ects which wouldarise if I attempted to produce such result without the addition of Ivanadium. As an exam le of the steel made, the fol owing is given: I;

4. A steel containin from 1/2 to 1 1/2 per cent. of copper and iromi/IOto 6/10 per cent. of vanadium.

In testimony of which invention, I have hereunto set' my hand this 17thday of June, 1908.

. HENRY D. BOOTH. Witnesses:

JOHN BROWN MOKEE, HENRY D. Boo'rH, Jr.

, at Philadelphia, on

